JavaFX tri-stated CheckBox in TableView

I want to bind a tri-state CheckBox inside a TableView with a bean property and i have an approximation but i'm sure there is an easy/better way to do it. I looked in google, but i didn't find my answer.

    public enum Attending {FALSE, TRUE, UNKNOWN}
    colEp.setCellFactory(new Callback<TableColumn<VentanaExtended, Attending>, TableCell<VentanaExtended, Attending>>() {

        @Override
        public TableCell<VentanaExtended, Attending> call(TableColumn<VentanaExtended, Attending> column) {
            return new TableCell<VentanaExtended, Attending>() {
                final CheckBox checkBox = new CheckBox() {
                    {
                        setAllowIndeterminate(true);
                    }

                };

                @Override
                public void updateItem(Attending item, boolean empty) {
                    super.updateItem(item, empty);
                    if (empty) {
                        setGraphic(null);
                    } else {
                        ((VentanaExtended) getTableRow().getItem()).attendingProperty().bind(Bindings.when(checkBox.indeterminateProperty()).
                                then(Attending.UNKNOWN).
                                otherwise(
                                        Bindings.when(checkBox.selectedProperty()).
                                        then(Attending.TRUE).
                                        otherwise(Attending.FALSE))
                        );
                        switch (item) {
                            case TRUE:
                                checkBox.setSelected(true);
                                break;
                            case FALSE:
                                checkBox.setSelected(false);
                                break;
                            case UNKNOWN:
                                checkBox.setIndeterminate(true);
                                break;
                        }
                        setGraphic(checkBox);
                    }
                }
            ;
        }
    ;
    }
    });